Simple Circuit 12V to 120V DC DC Converter

2016-04-21 18:20

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Its a simple circuit of 12V DC to 120V DC converter. The circuit consists of two phases first phase of the investor base and then a rectifier and filter stage. IC1 NE555 is wired as an astable multivibrator operating at a frequency of 100 Hz and can be adjusted to the preset R1. IC1 output is coupled to the clock input of IC2 is a dual CMOS D flip-flop. IC2 divides the pulse train of 100 Hz IC1 2 50 Hz pulse trains that are 180 degrees out of the party and offered on the pin 1 and 2 of IC2.

When pin 1 is high transistor Q1 conducts and current flows through the upper half of T1 primary winding. When pin 2 is the transistor Q2 conducts and high current flows through the lower half of the primary coil T1. As a result of a voltage of 120 V AC are induced in the secondary of T1. This voltage is rectified with bridge D1 to provide a 120V DC output. Capacitor C2 is the DC input filter, while C3, C4 are the output filters.

Notes. The circuit can be assembled on a vero board.Q1 and Q2 require heat sink.Output power of this dc dc converter is around 100 watts.IC1 and IC2 are to be mounted on holders.An optional 5A fuse can be added in series to the 12V supply line.T1 can be a 9-0-9V /250V/3A mains transformer.If 3A bridge is not available make one using 1N5408 diodes.Out of the two Flip-Flops inside CD4013 only one is used here.Output of IC1 must be set to 100Hz by adjusting preset R1
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